package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl  implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO){
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

      //判断商品是否存在购物车
        List<ShoppingCart> shoppingCartList=shoppingCartMapper.list(shoppingCart);

      //存在数量加一
        if(shoppingCartList !=null && shoppingCartList.size()>0){
            ShoppingCart cart = shoppingCartList.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }
        else {//不存在，插入数据
            //判断是菜品还是套餐

            Long setmealId = shoppingCartDTO.getSetmealId();
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            else {
                Setmeal setmeal = setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }
    public List<ShoppingCart> showShoppingCart(){
        Long userId = BaseContext.getCurrentId();
        ShoppingCart cart = ShoppingCart.builder().userId(userId).build();
        return shoppingCartMapper.list(cart);
    }
    public void clean(){
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO){
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断商品是否存在购物车
        List<ShoppingCart> shoppingCartList=shoppingCartMapper.list(shoppingCart);



        ShoppingCart cart = shoppingCartList.get(0);

        Integer number = cart.getNumber();

        cart.setNumber(cart.getNumber() - 1);
        shoppingCartMapper.updateNumberById(cart);



        //数量大于1的update减一
        //数量等于1的直接删除数据
    }
}
